Make sure full stack trace is logged on RT update failure
Make sure full stack trace is logged on RT update failure

Currently we swallow the exception printing only it's message regardless
of the logging levels. This is almost certainly not helpful enough as a
RT failing to update resources is almost always an actual bug in the
code.

Change-Id: I13f8f271842ee0811bef1eb3adb902973a3a2399

jianghuaw/nova,alaski/nova,sebrandon1/nova,dims/nova,vmturbo/nova,CEG-FYP-OpenStack/scheduler,CEG-FYP-OpenStack/scheduler,gooddata/openstack-nova,Juniper/nova,NeCTAR-RC/nova,hanlind/nova,gooddata/openstack-nova,rahulunair/nova,mikalstill/nova,NeCTAR-RC/nova,mahak/nova,bigswitch/nova,mikalstill/nova,zhimin711/nova,cloudbase/nova,openstack/nova,phenoxim/nova,BeyondTheClouds/nova,gooddata/openstack-nova,BeyondTheClouds/nova,jianghuaw/nova,vmturbo/nova,klmitch/nova,openstack/nova,Juniper/nova,alaski/nova,mahak/nova,BeyondTheClouds/nova,cloudbase/nova,rajalokan/nova,jianghuaw/nova,openstack/nova,klmitch/nova,vmturbo/nova,klmitch/nova,jianghuaw/nova,cernops/nova,cyx1231st/nova,bigswitch/nova,mahak/nova,hanlind/nova,klmitch/nova,cernops/nova,rahulunair/nova,mikalstill/nova,sebrandon1/nova,hanlind/nova,dims/nova,cernops/nova,rajalokan/nova,vmturbo/nova,phenoxim/nova,rajalokan/nova,cloudbase/nova,cyx1231st/nova,rahulunair/nova,zhimin711/nova,rajalokan/nova,Juniper/nova,sebrandon1/nova,gooddata/openstack-nova,Juniper/nova